Free Printable Exploring Chemical Reactions and Compounds

1.

This picture represents which of the following?

a)

element

b)

compound

2.

This picture represents which of the following?

a)

element

b)

compound

3.

¿ Qué cambio se esta produciendo en la imagen?

a)

Cambio físico.

b)

Cambio químico .

4.

What type of reaction involves the breaking down of a substance into simpler substances?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

5.

A copper penny turning greenish after a few years is an example of ...

a)

Chemical Change

b)

Physical Change

6.

In this chemical equation, the elements in red are the_______.

a)

Products

b)

Reactants

c)

Subscripts

d)

Coefficients

7.

What is the molecular structure of table salt?

a)

Sandwich

b)

Molecular who?

c)

H2O

d)

NaCl

8.

How many atoms of Hydrogen are in this compound?

a)

1

b)

2

c)

3

d)

4

9.

What is a chemical reaction?

a)

A process where elements are destroyed

b)

A process where substances are transformed into new substances

c)

A process where compounds are broken into elements

d)

A process where elements are created from compounds

10.

Which of the following is an example of a compound?

a)

Oxygen

b)

Water

c)

Hydrogen

d)

Nitrogen

11.

What is the main difference between elements and compounds?

a)

Elements are made of atoms, compounds are made of molecules

b)

Elements are pure substances, compounds are mixtures

c)

Elements cannot be broken down into simpler substances, compounds can

d)

Elements are always gases, compounds are always solids

12.

Which of the following is a type of chemical reaction?

a)

Melting

b)

Combustion

c)

Freezing

d)

Evaporation

13.

How are compounds formed from elements?

a)

By mixing elements physically

b)

By chemically combining elements

c)

By heating elements

d)

By cooling elements

14.

What is the word equation for the reaction of hydrogen and oxygen to form water?

a)

Hydrogen + Oxygen → Water

b)

Water → Hydrogen + Oxygen

c)

Hydrogen + Water → Oxygen

d)

Oxygen + Water → Hydrogen

15.

Which of the following is a synthesis reaction?

a)

$2H_2O \rightarrow 2H_2 + O_2$

b)

$2H_2 + O_2 \rightarrow 2H_2O$

c)

$CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$

d)

$NaCl \rightarrow Na + Cl_2$

16.

Which of the following is a decomposition reaction?

a)

$2H_2 + O_2 \rightarrow 2H_2O$

b)

$2H_2O \rightarrow 2H_2 + O_2$

c)

$CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$

d)

$Na + Cl_2 \rightarrow NaCl$

17.

What is the main characteristic of a combustion reaction?

a)

It involves the formation of a precipitate

b)

It involves the release of energy in the form of heat and light

c)

It involves the absorption of energy

d)

It involves the formation of a gas

18.

Which of the following is an example of an element?

a)

Water

b)

Carbon

c)

Salt

d)

Sugar

19.

What is the word equation for the reaction of sodium and chlorine to form sodium chloride?

a)

Sodium + Chlorine → Sodium Chloride

b)

Sodium Chloride → Sodium + Chlorine

c)

Sodium + Water → Sodium Chloride

d)

Chlorine + Water → Sodium Chloride

20.

What is the chemical formula for carbon dioxide?

a)

$CO$

b)

$CO_2$

c)

$C_2O$

d)

$C_2O_2$

21.

What is the main difference between a compound and a mixture?

a)

Compounds are chemically combined, mixtures are physically combined

b)

Compounds are always solids, mixtures are always liquids

c)

Compounds can be separated by physical means, mixtures cannot

d)

Compounds are made of elements, mixtures are made of compounds

Exploring Chemical Reactions and Compounds

Total questions: 21

Worksheet time: 11mins

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